Simplify getting started with SRE Agent using a CLI that guides you through the setup

[osw282]

This PR introduces an SRE Agent CLI to streamline the quick start process for the sre-agent and includes a guide to help you set it up.

Currently the cli will help the user to spin up the sre-agent using docker compose.

TODO

• Release sre-agent as an installable Python package via pypi

What

Why

How

Extra

If new dependencies are introduced to the project, please list them here:

• new dependency

Checklist

Please ensure you have done the following:

• I have run application tests ensuring nothing has broken.
• I have updated the documentation if required.
• I have added tests which cover my changes.

Type of change

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[tomstockton]

P1: AnthropicClient.__init__ logs the raw ANTHROPIC_API_KEY value in sre_agent/llm/utils/clients.py (lines ~72-83). This leaks the secret to logs/centralized logging. Please remove the raw key from logging; log only presence/length or a masked value to avoid credential exposure.